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Old 06-12-2014, 07:13 PM   #1
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Nutter Bypass without IMC???.....

So I just got done installing my Weber 38 and I decided to do the Nutter Bypass...Well, when I started I noticed my distributor was not stock...no biggie...except it's not hooked up with the stock wire harness. At this point, I decided to look for the IMC and go from there...problem is...there is no IMC as far as I can tell. I was able to trace down one wire that came directly from the distributor and spliced into a yellow wire on a unplugged harness. If I unhook this wire the jeep will not start. I was going to just run the two wires from the distributor to the IMC, but now I am not sure what to do with it. Looks like the PO just wrecked the wiring up for this. By the way, anyone know what type of distributor this is? Thanks!
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Old 06-12-2014, 07:14 PM   #2
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Old 06-12-2014, 07:15 PM   #3
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Another.
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Old 06-12-2014, 07:19 PM   #4
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Sorry...it wouldn't let me post multiple pics.
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Old 06-12-2014, 07:21 PM   #5
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Last one...I promise!
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Old 06-12-2014, 09:06 PM   #6
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Its an HEI distributor. The ICM is in the distributor itself. No need to worry as long as your jeep is running.

No need to do nutter bypass either. The yellow wire is your ignition wire to tell the distributor your vehicle is on.
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Old 06-12-2014, 10:18 PM   #7
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That makes a lot of since now. Still learning about my new jeep. So I'm assuming this is a desired upgrade for the 258? I'm about to throw new plugs into her, what is the recommended gap? I know HEI allows for a wider gap.
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Old 06-12-2014, 10:52 PM   #8
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I have an HEI, but some have been known to eat the cam gear. It's desired if you have a quality HEI. Gap could be anywhere from .045 to .055 depending on the voltage of the ignition coil. I'd start at .045 and go up to maybe .050. Stock is .035 so anything higher is better.
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Old 06-15-2014, 03:01 PM   #9
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Does the HEI help with MPG as well?

Which one is a "quality HEI"?
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Old 06-15-2014, 03:24 PM   #10
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Quote:
Originally Posted by superdiver View Post
Does the HEI help with MPG as well?

Which one is a "quality HEI"?
Well, I think im getting like 10 mpg right now, but there could be other contributors to that.
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Old 06-15-2014, 03:38 PM   #11
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Quote:
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Does the HEI help with MPG as well?

Which one is a "quality HEI"?
The ignition upgrade will save you anywhere from 1-2 mpg. A quality brand would be CRT performance, but I don't recommend the HEI route. Check these links. This route is probably the best you can do and it's basically the same work as a tune up. I-6 'TeamRush Upgrade' (definitive) - JeepForum.com Also safer than HEI, plus you can get HEI performance with an E-Core coil and Chevy HEI ICM Civilian Jeep.Info "Stealth HEI"
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Old 06-15-2014, 04:08 PM   #12
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I've been using a HEI from CRT for over a year and 8000 miles in my 4.2l. No problems at all and of course easy to install.

HEI : CRT HEI Distributor
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Old 06-15-2014, 07:51 PM   #13
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By the way, what could be causing my MPGs to be so low? After 2 tanks of gas I am averaging around 6 MPG. I have put in the new Weber 38, new plugs/wires, general tune up...if I were in 4wheel all the time, how much could that impact it? I'm pretty sure my 4x4 actuator doesn't work and I'm wondering if the PO manually put it in 4 wheel permanently. I've got broken off bolts holding it in, so I haven't had a chance to open it up.
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Old 06-15-2014, 08:11 PM   #14
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I would have to guess that its running extremely rich.
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Old 06-15-2014, 08:42 PM   #15
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Floats might be stuck (down position) with the gas supply valve in the open position. Also what are you running for a gas/fuel filter, and does it have a fuel return line to the gas tank? Fuel pressure needs to be low for the weber.
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Old 06-16-2014, 12:26 PM   #16
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I was thinking my MPG was very low....but maybe not?? I am getting 12-14 MPG.... 4.2 with a nutter and 29s for tires i believe? But as soon as I wear those mothers down i am gonna try 30 or 31 for tires...
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Old 06-16-2014, 06:00 PM   #17
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Quote:
Originally Posted by 4LinkFan View Post
Floats might be stuck (down position) with the gas supply valve in the open position. Also what are you running for a gas/fuel filter, and does it have a fuel return line to the gas tank? Fuel pressure needs to be low for the weber.
Just your basic fuel filter 1 inlet 2 outlet. No fuel regulator. Should I be using one? Also, finally got the bolt out for my 4x4 actautor plate. The PO jerry rigged bailing wire, rubber hose and zip ties to lock the collar into 4x4...
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Old 06-16-2014, 09:02 PM   #18
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Quote:
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Just your basic fuel filter 1 inlet 2 outlet. No fuel regulator. Should I be using one? Also, finally got the bolt out for my 4x4 actautor plate. The PO jerry rigged bailing wire, rubber hose and zip ties to lock the collar into 4x4...
You should definitely have a fuel pressure regulator with the weber carbs on a jeep. Weber's work best from around 2-3 psi, and your stock pump puts out about 5-6 psi. The Holley 12-804 is the fuel pressure regulator you want. Might save gas too not having fuel pressure to the Carb.

As for the 4x4, get a posi cable lock, or get a full axle shaft from a TJ wrangler or post 1996 XJ cherokee

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